If I am on a landline call ( wired phone and not cordless ), my iPhone close by chirps into the landline call creating a static noise for 4 to 5 seconds. This is when it is locked, screen shut off and no activity should be going on. I do not have any periodic check of email etc. Apple care folks did not have any answer to this. Does this happen to anyone? My other cell phones used to affect the AM radio if it is nearby which is understandable but this is the first time I have a cell phone introduce static onto a landline call. Has anyone experienced this?